This track was probably made by the hind foot Edmontosaurus. Edmontosaurus was one of the last non-avian dinosaurs, and lived alongside dinosaurs like Triceratops and Tyrannosaurus shortly before the Cretaceous–Paleogene extinction event that occurred 66 million years ago.
Some 66 million years ago a dinosaur stepped into some soft mud leaving its foot impression, the negative. Over time the track was buried by other sediments of a different texture that fossilized over time. Millions of years later the original track was eroded away leaving a cast of the original track, the positive. The last photo shows how the foot and bones would have fit into the track.
Edmontosaurus was a large bipedal plant-eating dinosaur found in western North America. It belonged to a group of the "duckbilled or hadrosaur dinosaurs", characterized by a particular denture formed by batteries of hundreds of small lozenge teeth for pulverizing the tough plant food.
Edmontosaurus was among the largest hadrosaurids: depending on the species, a fully-grown adult could have been 9 meters (30 feet) long, and some of the larger specimens reached the range of 12 meters (39 feet) to 13 meters (43 feet) long. Its weight was on the order of 4.0 metric tons (4.4 short tons).
Edmontosaurus was widely distributed across western North America. The distribution of Edmontosaurus fossils suggests that it preferred coasts and coastal plains. It was an herbivore that could move on both two legs and four. Because it is known from several bone beds, Edmontosaurus is thought to have lived in groups, and may have been migratory as well. The wealth of fossils has allowed researchers to study its Paleobiology in detail, including its brain, how it may have fed, and its injuries and pathologies, such as evidence for tyrannosaur attacks on a few Edmontosaurus specimens.
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